[gcc r15-5639] Fix uninitialized operands[2] in vec_unpacks_hi_v4sf.

[hongtao Liu via Gcc-cvs]

https://gcc.gnu.org/g:ba4cf2e296d8d5950c3d356fa6b6efcad00d0189

commit r15-5639-gba4cf2e296d8d5950c3d356fa6b6efcad00d0189
Author: liuhongt <hongtao....@intel.com>
Date:   Thu Nov 21 23:57:38 2024 -0800

    Fix uninitialized operands[2] in vec_unpacks_hi_v4sf.
    
    It could cause weired spill in RA when register pressure is high.
    
    gcc/ChangeLog:
    
            PR target/117562
            * config/i386/sse.md (vec_unpacks_hi_v4sf): Initialize
            operands[2] with CONST0_RTX.

Diff:
---
 gcc/config/i386/sse.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 72acd5bde5e4..498a42d6e1e8 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -10424,7 +10424,10 @@
        (match_dup 2)
        (parallel [(const_int 0) (const_int 1)]))))]
   "TARGET_SSE2"
-  "operands[2] = gen_reg_rtx (V4SFmode);")
+{
+  operands[2] = gen_reg_rtx (V4SFmode);
+  emit_move_insn (operands[2], CONST0_RTX (V4SFmode));
+})
 
 (define_expand "vec_unpacks_hi_v8sf"
   [(set (match_dup 2)